operator [] method
The object at the given index
in the list.
The index
must be a valid index of this list,
which means that index
must be non-negative and
less than length.
Implementation
@override
E operator [](int index) {
if (index < 0 || index >= length) {
throw RangeError.index(index, this); // Check bounds
}
return _list[index + start];
}